glacial striations on basalt columns - devils postpile (california)

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glacial striations on basalt columns - devils postpile (california)

The top of the columns of Devils Postpile - Columnar Basalt in the Eastern Sierra (California)

A basalt volcanic flow formed hexagonal-shaped columns when it cooled down.­

You can clearly see the parallel grooves showing the erosion caused by debris pushed by the slow-moving ice of the glacier that used to cover this valley.­ Those marks are called glacial striations.­

For more info about this rock formation, go to en.­wikipedia.­org/­wiki/­Devils_­Postpile_­National_­Monument.

california
columnar basalt
columns
devils postpile
eastern sierra
erosion
forest
geology
glacial polish
glacial striations
lava flow
rock formation
trees
volcanic
October 27, 2014
Inyo National Forest, Pacific Crest Trail, California, USA